John Derg Sutherland
John Derg Sutherland (23 April 1905 – 14 June 1991), also known as Jock Sutherland, was a Scottish physician, psychoanalyst and theorist, notable also for his role as Medical Director of the Tavistock Clinic. == Life and career == John "Jock" Derg Sutherland was born in Edinburgh on 23 April 1905, the sixth of eight children.